Application - ABB RELION REX640 Technical Manual

Section 8
Measurement functions
8.5.5
1348
Inputs
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 1 0
0 1 0
0 1 0
0 1 0
0 1 0
... ...

Application

TPOSYLTC provides tap position information for other functions as a signed integer
value that can be fed to the tap position input.
The position information of the tap changer can be coded in various methods for many
applications, for example, the differential protection algorithms. In this function, the
binary inputs in the transformer terminal connector are used as inputs to the function.
The coding method can be chosen by setting the mode parameter. The available
coding methods are BCD, Gray and Natural binary coding. Since the number of binary
inputs are limited to seven, the coding functions are limited to seven bits including the
sign bit and thus the six bits are used in the coding functions. The position limits for
the tap positions at BCD, Gray and Natural binary coding are ±39, ±63 and ±63
respectively.
In this example, the transformer tap changer position indication is wired as a mA
signal from the corresponding measuring transducer. The position indication is
connected to input 1 (AI_VAL1) of the (RTD) module. The tap changer operating
range from the minimum to maximum turns of the tap and a corresponding mA signal
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
0 1 1
1 0 0
1 0 0
1 0 1
1 0 1
1 1 0
1 1 0
1 1 1
1 1 1
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
...
1MRS759142 C
TAP_POS outputs
0 16 10
1 17 11
0 18 12
1 19 13
0 20 14
1 21 15
0 22 16
1 23 17
0 24 18
1 25 19
0 26 19
1 27 19
0 28 19
1 29 19
0 30 19
1 31 19
0 32 20
1 33 21
0 34 22
1 35 23
0 36 24
... ... ...
Technical Manual
31
30
28
29
24
25
27
26
16
17
19
18
23
22
20
21
63
62
60
61
56
...
REX640